Libretro API v2

Project files for libretro v2

Libretro API linux work

Libretro API touchups

libretrov1.dll compiles under windows

And builds on linux now too

Cosmetics

Fix extra audio methods and begin xbmc implementation

Begin rename to xbmc_game api

rename xbmc_game_callbacks to xbmc_game_callbacks.h

Continue re-aligning code with new game api name

Adapt game api headers

VS Update

More files being moved into place...

Work in progress

"Finished" library.xbmc.game and library.xbmc.libretro